Brittany Snow thinks she's a ''really bad twerker''.

The 'Pitch Perfect' star has admitted she hasn't quite perfected the dance move yet despite receiving training on how to do it in rehearsals for the second instalment of the popular film.

She said: ''I'm a really bad twerker - I still haven't figured out how to do it.

''I actually hurt my back one day. I woke up the next morning and my back was completely tweaked out ... from twerking.''

Despite not being able to perfect the move, the 29-year-old actress admitted the scene in the musical comedy film involving the dance was one of her favourites.

She added: ''One of my favourite scenes to do in 'Pitch Perfect 2' was this number where we really get dirty with our dancing.

''We had a month of rehearsals learning how to do things I'm just not cool enough to do in my real life.''

Meanwhile, Brittany - who has been dating 'Teen Wolf' star Tyler Hoechlin since 2013 - also opened up about her relationship and says she prefers to keep it off social media in order to preserve it's ''magic''.

She added to the May issue of Cosmopolitan magazine: ''We like to keep our moments to ourselves, which is why we don't do much social media. We're not hiding anything. We're not not wanting people to know.

''Social media, for me, is about interacting with people who follow my career. I don't think my relationship has anything to do with my career. So we just keep it simple, try not to think about it that much, and just be us.''